(PECL imagick 2, PECL imagick 3)
Imagick::thresholdImage — Changes the value of individual pixels based on a threshold
Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
threshold
channel
成功时返回 true。
示例 #1 Imagick::thresholdImage()
<?php
function thresholdimage($imagePath, $threshold, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->thresholdimage($threshold * \Imagick::getQuantum(), $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>